This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A334234 #12 Apr 27 2020 23:58:38 %S A334234 0,0,1,1,0,0,1,2,3,3,2,1,0,0,1,1,0,0,1,2,3,3,2,2,3,4,5,5,4,4,5,6,7,7, %T A334234 6,5,4,4,5,5,4,3,2,2,3,3,2,1,0,0,1,1,0,0,1,2,3,3,2,1,0,0,1,1,0,0,1,2, %U A334234 3,3,2,2,3,4,5,5,4,4,5,6,7,7,6,6,7,7,6 %N A334234 a(n) is the Y-coordinate of the point at n steps forward from the origin along the H-order curve defined in A334232; sequence A334233 gives X-coordinates. %H A334234 Rémy Sigrist, <a href="/A334234/b334234.txt">Table of n, a(n) for n = 0..8193</a> %H A334234 Rémy Sigrist, <a href="/A334234/a334234.gp.txt">PARI program for A334234</a> %H A334234 <a href="/index/Con#coordinates_2D_curves">Index entries for sequences related to coordinates of 2D curves</a> %F A334234 A334232(a(n), A334233(n)) = n. %e A334234 The "forward" branch of H-order curve starting from the origin is as follows: %e A334234 7| 32 %e A334234 | | %e A334234 6| 31 %e A334234 | | %e A334234 5| 26...27 30 %e A334234 | | | | %e A334234 4| 25 28...29 %e A334234 | | %e A334234 3| 8....9 24 21...20 %e A334234 | | | | | | %e A334234 2| 7 10 23...22 19 %e A334234 | | | | %e A334234 1| 2....3 6 11 14...15 18 %e A334234 | | | | | | | | %e A334234 0| 0....1 4....5 12...13 16...17 %e A334234 ---+---------------------------------------- %e A334234 y/x| 0 1 2 3 4 5 6 7 %e A334234 - hence a(25) = a(28) = a(29) = 4. %o A334234 (PARI) See Links section. %Y A334234 Cf. A334232, A334233. %K A334234 nonn %O A334234 0,8 %A A334234 _Rémy Sigrist_, Apr 20 2020